CN103320193B - Device and method for manufacturing high quality natural gas by purifying methane - Google Patents
Device and method for manufacturing high quality natural gas by purifying methane Download PDFInfo
- Publication number
- CN103320193B CN103320193B CN201310282160.5A CN201310282160A CN103320193B CN 103320193 B CN103320193 B CN 103320193B CN 201310282160 A CN201310282160 A CN 201310282160A CN 103320193 B CN103320193 B CN 103320193B
- Authority
- CN
- China
- Prior art keywords
- gas
- biogas
- swing adsorption
- pressure swing
- temp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003345 natural gas Substances 0.000 title abstract description 14
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 238000001179 sorption measurement Methods 0.000 claims abstract description 58
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000010926 purge Methods 0.000 claims description 28
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 9
- 238000011069 regeneration method Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 52
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002808 molecular sieve Substances 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- PVXVWWANJIWJOO-UHFFFAOYSA-N 1-(1,3-benzodioxol-5-yl)-N-ethylpropan-2-amine Chemical compound CCNC(C)CC1=CC=C2OCOC2=C1 PVXVWWANJIWJOO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QMMZSJPSPRTHGB-UHFFFAOYSA-N MDEA Natural products CC(C)CCCCC=CCC=CC(O)=O QMMZSJPSPRTHGB-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Drying Of Gases (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention provides a device for manufacturing high quality natural gas by purifying methane. The device comprises a main gas flowing path and a gas recovering branch along the gas flowing direction, wherein the main gas flowing path is successively provided with a methane filter separator, a methane compressor, a cooler, a gas-liquid separator, a devulcanizer, a temperature swing adsorption dryer and a pressure swing adsorption purifier from the upper stream to the down stream; the methane filter separator is communicated with the raw material methane, and the manufactured high quality natural gas is output from the outlet of the pressure swing adsorption purifier; one end of the gas recovering branch is communicated with a tail gas outlet of the pressure swing adsorption purifier, and the other end of the gas recovering branch is communicated with a regenerated gas inlet of the temperature swing adsorption dryer. The invention also provides a method for preparing high quality natural gas by the method. Compared with the prior art, the device provided by the invention has the advantages that the structure is simple, the flow path of the preparation method is simple, the technology is reliable, and the components, except for CH4, in the methane can be removed to obtain the high quality natural gas.
Description
Technical field
The present invention relates to a kind of devices and methods therefor preparing quality gas, particularly relate to a kind of devices and methods therefor utilizing marsh gas purifying to prepare quality gas.
Background technology
Gas utilization field widely, as: the fuel of generating, petrochemical industry, machine-building, glass ceramics, automobile, central air conditioning or raw material, the quality requirements of the every application of above-mentioned natural gas to natural gas is more and more higher.Mandatory national standards GB17820-2012 " natural gas ", also has higher requirement to the quality of natural gas: improve a class gas gas quality index, high calorific power is by being originally greater than 31.4 MJ/m
3bring up to and be greater than 36MJ/m
3, carbon dioxide rises to be less than or equal to 2.0% by being less than or equal to 3.0%, and total sulfur is by being not more than 100 mg/m
3bring up to and be not more than 60 mg/m
3.
The current whole world about has the biogas of several hundred million ten thousand tons to enter air every year, wastes a large amount of regenerative resources while contaminated environment.The key component of biogas is CH
4, CO
2, H
2o, N
2, O
2, H
2s, because trace impurity is not easily removed, is only limitted to adopt liquid phase scrubbing method (as MDEA) to deviate from CO at present
2.
Summary of the invention
In view of this, first object of the present invention is to provide a kind of device of marsh gas purifying quality gas, and this device can remove CH by biogas
4outer constituent part removes, and purified gas is the natural gas of high-quality, can be used as unstripped gas natural gas quality being required to high industry.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of marsh gas purifying quality gas device, it is characterized in that: according to gas flow, this marsh gas purifying quality gas device comprises a main flow of gas road and a gas reclaims branch road, described main flow of gas road is from upstream to downstream and has biogas filter separator, Marsh gas compression machine, cooler, gas-liquid separator, devulcanizer, Temp .-changing adsorption drier and pressure swing adsorption purge device successively, described biogas filter separator is connected with raw material biogas, and obtained quality gas exports from the outlet of described pressure swing adsorption purge device; Described gas reclaims branch road one end and is connected with the offgas outlet of pressure swing adsorption purge device, and the other end is connected with the regeneration gas import of Temp .-changing adsorption drier.
Wherein, described Temp .-changing adsorption drier and TSA drier, described pressure swing adsorption purge device and PSA clarifier.
Preferably, described device has two groups of Temp .-changing adsorption driers at least, and wherein one group is used for absorption, and one group is used for regeneration.
Preferably, described device has many group pressure swing adsorption purge devices.
Further preferably, described many group pressure swing adsorption purge devices are connected to sequencing valve.
Preferably, the port of export of described pressure swing adsorption purge device is also connected with flowmeter, and obtained quality gas is discharged by the outlet of described flowmeter.
Second object of the present invention is to provide a kind of method adopting said apparatus to prepare quality gas, it is characterized in that, comprises the following steps:
(1) by biogas filter separator, the impurity of raw material biogas and portion of water isolated by filtration are fallen;
(2) biogas after isolated by filtration is compressed to certain pressure by Marsh gas compression machine;
(3) after the supercharging of Marsh gas compression machine, cooler, gas-liquid separator refrigerated separation is entered successively, the fractional saturation water in removing biogas;
(4) then enter devulcanizer and remove H in biogas component
2s;
(5) H is removed
2the biogas of S enters in Temp .-changing adsorption drier again and carries out the degree of depth and dewater;
(6) biogas after Temp .-changing adsorption dehydration enters in pressure swing adsorption purge device, removes the CO in biogas
2, N
2, O
2, finally obtain quality gas.
Preferably, biogas in step (2) is 0.6 ~ 1.2Mpa by the pressure after compressor boost, in step (3), the cooled biogas temperature of cooler is 5 ~ 30 DEG C, in step (5), the heating-up temperature of Temp .-changing adsorption drier is 150 ~ 350 DEG C, and in step (6), the adsorptive pressure of pressure swing adsorption purge device is 0.5 ~ 1.2Mpa.
Preferably, the desulfurizing agent employing that described devulcanizer uses take iron oxide as the catalyst of active component, the filler of described Temp .-changing adsorption drier adopts aluminium oxide and molecular sieve compounded mix, and the filler of described pressure swing adsorption purge device adopts the compounded mix of active carbon and aluminium oxide and molecular sieve.
Preferably, described method also comprises step: be back in Temp .-changing adsorption drier after the tail gas recycle that (7) pressure swing adsorption purge device parses and use as regeneration gas.
Compared to prior art, simply, the method adopting this device to prepare quality gas adopts advanced dry method flow process to the apparatus structure of marsh gas purifying quality gas of the present invention, and technology is reliable, and flow process is simple, can remove CH by biogas
4outer constituent part removes, and purified gas is the natural gas of high-quality, can be used as unstripped gas natural gas quality being required to high industry.Adopt apparatus and method of the present invention, biogas can be prepared into quality gas, solve the difficult problem that preparation quality gas cost is high on the one hand, and safe and stable arrangement, pollution-free, energy consumption is low; On the other hand, the natural gas of high-quality has wide market, can be applied in as petrochemical industry, automobile etc. widely, and in the very high industry of hydrogen purity requirement, therefore, apparatus and method of the present invention have broad application prospects.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the device of biogas quality gas of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
Refer to Fig. 1, the invention provides a kind of device of marsh gas purifying quality gas, according to gas flow, as the direction from left to right of arrow indication in Fig. 1, this marsh gas purifying quality gas device comprises a main flow of gas road 10 and a gas reclaims branch road 20, described main flow of gas road 10 is from upstream to downstream and has biogas filter separator 1 successively, Marsh gas compression machine 2, cooler 3, gas-liquid separator 4, devulcanizer 5, Temp .-changing adsorption drier 6, pressure swing adsorption purge device 7 and the flowmeter 8 being connected to adsorption cleaning device 7 port of export, described biogas filter separator 1 is connected with raw material biogas, obtained quality gas discharges from the outlet of described flowmeter 8, described gas reclaims branch road 20 one end and is connected with the offgas outlet of pressure swing adsorption purge device 7, and the other end is connected with the regeneration gas import of Temp .-changing adsorption drier 6.The cooling water throughput direction of cooler 3 is as the direction from bottom to up of arrow indication in Fig. 1.
Wherein, described Temp .-changing adsorption drier 6 i.e. TSA drier, described pressure swing adsorption purge device 7 i.e. PSA clarifier.The Temp .-changing adsorption drier 6 of described device has two groups at least, and wherein one group is used for absorption, and one group is used for regeneration.Described device has many group pressure swing adsorption purge devices 7.Described many group pressure swing adsorption purge devices 7 are connected to sequencing valve, with the use of.
Adopt said apparatus to prepare the method for quality gas, comprise the following steps:
(1) by biogas filter separator 1, the impurity of raw material biogas and portion of water isolated by filtration are fallen;
(2) biogas after isolated by filtration is compressed to certain pressure by Marsh gas compression machine 2, and biogas is 0.6 ~ 1.2Mpa by the pressure after compressor boost;
(3) after the supercharging of Marsh gas compression machine, enter cooler 3, gas-liquid separator 4 refrigerated separation successively, the fractional saturation water in removing biogas, wherein the cooled biogas temperature of cooler is 5 ~ 30 DEG C;
(4) then enter devulcanizer 5 and remove H in biogas component
2s, the desulfurizing agent employing that devulcanizer 5 uses take iron oxide as the catalyst of active component;
(5) H is removed
2the biogas of S enters in Temp .-changing adsorption drier 6 again and carries out the degree of depth and dewater, and the heating-up temperature of Temp .-changing adsorption drier 6 is 150 ~ 350 DEG C, and the filler of Temp .-changing adsorption drier 6 adopts aluminium oxide and molecular sieve compounded mix;
(6) biogas after Temp .-changing adsorption dehydration enters in pressure swing adsorption purge device 7, removes the CO in biogas
2, N
2, O
2finally obtain quality gas, the quality gas obtained is discharged by the outlet of flowmeter 8, and wherein the adsorptive pressure of pressure swing adsorption purge device 7 is 0.5 ~ 1.2Mpa, and the filler of pressure swing adsorption purge device 7 adopts the compounded mix of active carbon and aluminium oxide and molecular sieve;
(7) be back in Temp .-changing adsorption drier 6 after the tail gas recycle that pressure swing adsorption purge device 7 parses and use as regeneration gas.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. the device of a marsh gas purifying quality gas, it is characterized in that: according to gas flow, this device comprises a main flow of gas road and a gas reclaims branch road, described main flow of gas road is from upstream to downstream and has biogas filter separator, Marsh gas compression machine, cooler, gas-liquid separator, devulcanizer, Temp .-changing adsorption drier and pressure swing adsorption purge device successively, described biogas filter separator is connected with raw material biogas, and obtained quality gas exports from the outlet of described pressure swing adsorption purge device; Described gas reclaims branch road one end and is connected with the offgas outlet of pressure swing adsorption purge device, and the other end is connected with the regeneration gas import of Temp .-changing adsorption drier;
Described device has two groups of Temp .-changing adsorption driers at least, and wherein one group is used for absorption, and one group is used for regeneration;
Having of described marsh gas purifying quality gas device organizes pressure swing adsorption purge device more, and described many group pressure swing adsorption purge devices are connected to sequencing valve.
2. the device of marsh gas purifying quality gas according to claim 1, is characterized in that: the port of export of described pressure swing adsorption purge device is also connected with flowmeter, and obtained quality gas is discharged by the outlet of described flowmeter.
3. adopt device according to claim 1 to prepare the method for quality gas, it is characterized in that, comprise the following steps:
(1) by biogas filter separator, the impurity of raw material biogas and portion of water isolated by filtration are fallen;
(2) biogas after isolated by filtration is compressed to certain pressure by Marsh gas compression machine;
(3) after the supercharging of Marsh gas compression machine, cooler, gas-liquid separator refrigerated separation is entered successively, the fractional saturation water in removing biogas;
(4) then enter devulcanizer and remove H in biogas component
2s;
(5) H is removed
2the biogas of S enters in Temp .-changing adsorption drier again and carries out the degree of depth and dewater;
(6) biogas after Temp .-changing adsorption dehydration enters in pressure swing adsorption purge device, removes the CO in biogas
2, N
2, O
2, finally obtain quality gas;
(7) be back in Temp .-changing adsorption drier after the tail gas recycle that pressure swing adsorption purge device parses and use as regeneration gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310282160.5A CN103320193B (en) | 2013-07-05 | 2013-07-05 | Device and method for manufacturing high quality natural gas by purifying methane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310282160.5A CN103320193B (en) | 2013-07-05 | 2013-07-05 | Device and method for manufacturing high quality natural gas by purifying methane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103320193A CN103320193A (en) | 2013-09-25 |
| CN103320193B true CN103320193B (en) | 2015-03-25 |
Family
ID=49189240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310282160.5A Expired - Fee Related CN103320193B (en) | 2013-07-05 | 2013-07-05 | Device and method for manufacturing high quality natural gas by purifying methane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103320193B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106281520A (en) * | 2015-05-15 | 2017-01-04 | 肇庆新奥燃气有限公司 | A kind of double-tower molecular sieve Gas Dehydration System |
| CN106544071A (en) * | 2016-07-19 | 2017-03-29 | 上海利策科技股份有限公司 | A kind of offshore gas field natual gas dehydrate unit |
| CN107937075A (en) * | 2017-11-29 | 2018-04-20 | 四川科华石油化工设备工程有限公司 | The technique that CNG is produced in a kind of marsh gas purifying purification |
| CN110408443B (en) * | 2018-04-27 | 2021-06-04 | 逢甲大学 | Biogas desulfurization system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161925A (en) * | 2011-03-14 | 2011-08-24 | 开封黄河空分集团有限公司 | Process for producing biological natural gas by using methane |
| CN102627280A (en) * | 2011-07-14 | 2012-08-08 | 西南化工研究设计院 | Method for purifying and concentrating CO from calcium carbide furnace gas |
| CN102643694A (en) * | 2012-04-27 | 2012-08-22 | 新地能源工程技术有限公司 | Technique and device for drying and liquefaction of natural gas |
| CN202558833U (en) * | 2012-05-16 | 2012-11-28 | 北京健坤伟华新能源科技有限公司 | Integrated methane purification system |
| CN203382732U (en) * | 2013-07-05 | 2014-01-08 | 苏州苏净保护气氛有限公司 | Device for producing high-quality natural gas by biogas purification |
-
2013
- 2013-07-05 CN CN201310282160.5A patent/CN103320193B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161925A (en) * | 2011-03-14 | 2011-08-24 | 开封黄河空分集团有限公司 | Process for producing biological natural gas by using methane |
| CN102627280A (en) * | 2011-07-14 | 2012-08-08 | 西南化工研究设计院 | Method for purifying and concentrating CO from calcium carbide furnace gas |
| CN102643694A (en) * | 2012-04-27 | 2012-08-22 | 新地能源工程技术有限公司 | Technique and device for drying and liquefaction of natural gas |
| CN202558833U (en) * | 2012-05-16 | 2012-11-28 | 北京健坤伟华新能源科技有限公司 | Integrated methane purification system |
| CN203382732U (en) * | 2013-07-05 | 2014-01-08 | 苏州苏净保护气氛有限公司 | Device for producing high-quality natural gas by biogas purification |
Non-Patent Citations (1)
| Title |
|---|
| 吴彦敏."气体纯化".《气体纯化》.国防工业出版社,1983,25-36、97-116、166-181. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103320193A (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108179046A (en) | A kind of method of coke-stove gas hydrogen making and LNG | |
| CN1274648C (en) | Production and apparatus for producing methane from refuse embedded gas | |
| CN102980374B (en) | The preparation method of high purity liquid carbon dioxide and device | |
| CN103320193B (en) | Device and method for manufacturing high quality natural gas by purifying methane | |
| CN106281476B (en) | A kind of method of sour gas in low temperature washing device for methanol and a kind of removing synthesis gas | |
| CN104479779A (en) | Method, device and system for separating carbon dioxide in raw material gas by using membrane | |
| CN207805334U (en) | The trapping retracting device of carbon dioxide in flue gas | |
| CN107285279B (en) | A method of purified synthesis gas using Quan Wencheng pressure-variable adsorption with separate | |
| CN103421565B (en) | Gas film separates the synchronous liquid CO of recovery2Biogas decarbonization process and device | |
| CN104587804A (en) | Device system for purifying by utilizing gas separation membrane | |
| CN103170218B (en) | Methane purifying method and system | |
| CN104909456A (en) | Landfill leachate anaerobic biogas purification method | |
| CN106334412A (en) | Skid-mounted carbon dioxide gas absorption method and apparatus applicable to offshore platform | |
| CN102161925A (en) | Process for producing biological natural gas by using methane | |
| CN103695043A (en) | Method for drying, purifying and cooling conversion rough synthesized gas and SNG product gas through low-temperature methanol washing and device thereof | |
| CN206823471U (en) | A kind of MDEA biogas energy-saving decarbonation device | |
| CN203429144U (en) | Low-temperature methanol washing device with high CO2 yield | |
| CN203382732U (en) | Device for producing high-quality natural gas by biogas purification | |
| CN104498983A (en) | Method for preparation of high purity oxygen by water electrolysis | |
| CN203474745U (en) | Methane membrane separation decarbonization device | |
| CN104998517A (en) | Method for increasing concentrations of acid gas hydrogen sulfide and carbonyl sulfide in low-temperature methanol washing process | |
| CN204873823U (en) | Coke oven gas system liquefied natural gas's rich hydrogen tail gas processing apparatus | |
| CN204873835U (en) | Carbon dioxide's device among desorption nitrous oxide | |
| CN204093268U (en) | A kind of temperature swing absorption unit for the protection of membrane separation plant | |
| CN212327831U (en) | Environmental-friendly resourceful treatment system for fireflood tail gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |